<template>
  <div>
     <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>数据统计</el-breadcrumb-item>
      <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区 -->
    <el-card>
      <!-- 2.为 ECharts 准备一个定义了宽高的 DOM -->
      <div id="main" style="width:750px; height:400px;"></div>
    </el-card>
  </div>
</template>

<script>
  //1.导入echatrs
  import echarts from 'echarts'
  import _ from 'lodash'

  export default {  
    name: "Report",
    data() {
      return {
        options: { //需要合并的数据
          title: {
            text: '用户来源'
          },
          tooltip: {
            trigger: 'axis',
            axisPointer: {
              type: 'cross',
              label: { backgroundColor: '#E9EEF3'}
            }
          },
          grid: {
            left: '3%',
            right: '4%',
            bottom: '3%',
            containLabel: true
          },
          xAxis: [
            {
              boundaryGap: false
            }
          ],
          yAxis: [
            { type: 'value' }
          ]
        },
      }
    },
    created() {
      
    },
    //只要执行到mounted函数，页面上的DOM元素就被渲染完毕了
    async mounted() {
      //3.基于准备好的dom，初始化Echarts实例
      var myChart = echarts.init(document.getElementById('main'));

      const {data:res} = await this.$http.get('reports/type/1')
      if(res.meta.status != 200) {
        return this.$message.error('获取折线图数据失败！')
      }
      // 4.准备数据和配置项
      const result = _.merge(res.data, this.options)
      //5.展示数据
      myChart.setOption(result)
    },
    methods: {
      
    },
  }
</script>

<style lang="less" scope>

</style>